(5) Resetting valves, or removing
valves and replacing with valves supplied by purchaser: $0.50 per cylinder.
(c) For extraordinary expenses. Such expenses incurred in connection with any contract or delivery, including costs of repairing, cleaning, painting, or drying purchasers' containers, filling containers of types other than those referred to in § 1.1 (h), (j), and (k), compressing or purifying helium beyond normal plant pressure or purity, delivering helium at a point other than a helium plant selected by the Bureau, and unusual handling, transportation and communications, may be determined by the Bureau, on the basis of the cost of rendering the services, making due allowance for contingencies, overhead expense, commercial common- carrier rates, and intangible factors, and charged to the purchaser as they arise.
(d) For use of helium containers supplied by the Bureau. (1) Standard-type cylinders: $0.45 per cylinder per month or fraction of month; or, in lots of 500 or more, $3 per cylinder per year: Provided, That upon the written approval of the Bureau, purchasers may themselves give such cylinders the quinquennial hydrostatic test required by the Interstate Commerce Commission, and for each cylinder so tested will be allowed a credit of $0.75 on the rental charge: And provided further, That the minimum net charge under any one container contract shall be $45.
(2) For each round trip of a helium tank car:
(i) A fixed charge of $88, plus
(ii) A charge of $0.11 for each whole mile, or major fraction thereof, of the total round-trip mileage between the helium plant at which the car is filled and the helium delivery destination, according to the official mileage tariffs of the railroads concerned and via the shortest rail route by which the car could be routed between the two terminals in accordance with established routing practices and with proper regard to clearance and weight limitations, whether the car actually travels that route or a longer route, plus
(iii) A charge of $ 22 per day or fraction thereof for the time between placement on the purchaser's tracks or in other specified discharge position, and removal therefrom by the carrier for return shipment, less "free time" as defined in § 1.1 (1).
(3) For each helium semi-trailer: $10 for the first two days or part thereof, and $5 for each day or part thereof in excess of two days.
(e) For use of tractor. For a tractor with driver and fuel supplied by the Bureau for transportation of a helium semitrailer: $40 for each day or part thereof plus $0.20 for each mile traveled pulling the semi-trailer and $0.12 for each mile traveled by the tractor without the semitrailer.
(f) Computation of time periods. The time periods of days, months, or years. referred to in paragraph (d)(1) and (3) and paragraph (e) of this section, shall begin the day following that in which the standard-type cylinder, semitrailer, or tractor is placed in service for the purchaser, and shall end the day it is returned to the Bureau's service, except in the case of such containers or tractors placed in a purchaser's service and returned to the Bureau's service the same day. Any fractional period, including the period of use of a standard-type cylinder, semi-trailer or tractor placed in a purchaser's service and returned to the Bureau's service the same day, shall count as a whole period: Provided, That if a standard-type cylinder used at the annual rate is returned on the Bureau's demand pursuant to § 1.10 (b) (3), or is returned at the purchaser's option after it has been in the purchaser's continuous service for more than one year, a fractional year shall be prorated on a basis of months, each month or fractional month being charged for at $0.25. A standard-type cylinder, semi-trailer, or tractor shall not be considered to be returned to the Bureau's service until it is returned to the Bureau's point of origin or some other point designated by the Bureau, and, in the case of a standard-type cylinder used in making repeated shipments to the same purchaser, until it is released from that service. Seven o'clock, a. m. standard time, is the dividing line between days. The charge for the use of a standard-type cylinder, semi-trailer, or tractor shall abate during any period when it is out of service because of unserviceable condition not caused by any fault of the purchaser.
§ 1.4 Settlements under existing contracts. Uncompleted portions of contracts for the purchase of helium and for the use of containers in effect when the regulations in this part become effec-
